Sight base for firearms



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L. C. BOOTH SIGHT BASE FOR FIREARMS Filed Dec. :50 1922 2 Sheets-Sheet 1 IN1/Enron L CLBoo r11/r,

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L.. c. Bo'rl-l SIGHT BASE FOR FIREARMS Filed Dec. so. 1922 2 sheets-sheet 2 WIM/ESSE@ .at iitliitlitlbitl.

Patented Feb. 19, 1924.

ITED STATES LOUIS CHARLES BOOTH, OF SHERIDAN, WYOMING.

SIGHT BASE FOR FIREARMS.

Application filed December 30, 1922. Serial No. 609,981.

To all whom 'it may concern.'

Be it known that I, Louis CHARLES BOOTH, a citizen of the United States, and a resident of Sheridan, in the county 0f Sheridan and State of Wyoming, have invented certain new and useful Improvements in Sight Bases for Firearms, of which the following is a specification.

This invention is a sight base or mounting for fire arms and relates particularly to the type designed for mounting a peepsight on a rifle having a sliding bolt breech mechanism.

The invention has for its object the provision of means whereby a peep-sight may be mounted in operative position upon the sliding breech bolt of a rifie and behind the tiring pin thereof in a manner such that the sight will move with the breech as the same is opened and will be gradually returned to its adjusted or sighting position when the breech is closed and to this end the invention consists of certain new and improved features of construction and cornbination of parts to be hereinafter described and pointed out more particularly in the appended claims.

In the accompanying drawings in which like reference numerals designate like parts throughout,

Figure 1 is a side elevation of a rifle equipped with the invention.

Figure 2 is a sectional view taken on the line 2--2 of Figure 1 and looking along the rifle barrel.

Figure 3 is a sectional view taken on the line 3 3 of Figure 1.

Figure 4 is a detailed perspective view of the sight base.

Figure 5 is a perspective view of a modiied form of the invention app-lied to a bolt sleeve.

Figures 6 and 7 are detail perspective views of the invention.

In the drawings, the numeral 1 is used to designate generally a rie having a sliding bolt breech mechanism of the usual construction, the bolt and the firing pin of which are designated by the numerals 2 and 3 respectively and the breech bolt lever by the numeral 2a. As shown in Figure 1, the outer end of the breech bolt is provided with a sight base 4 shown in detail in Figure 4.

The sight base may be formed of any suitable material such as blued steel and comprises a body vportion 5, which is pref erably slightly arcuate in cross section as shown at 6 in Figures 2 and 3 to conform to the curved surface of the gun stock.

The body of the base may be gradually reduced in thickness towards its outer extremity 7 and is provided adjacent to said extremity with a plurality of apertures 8, said apertures being threaded and designed to receive screw bolts 9 whereby a foot plate 9a of a peep-sight l0 of the usual construction may be secured thereto as shown in Figure 5.

The opposite extremity of the base is bifurcated as shown at 11 and terminates in a plurality of legs 12, said legs lying in parallel planes substantially perpendicular to the plane of the body of the base. The legs 12 are upset a distance above the plane of the base as shown at 13 for a purpose to be hereinafter explained and each is pro vided with a plurality of apertures 14 designed to receive suitable screw bolts 15 whereby the sight base may be secured to the breech bolt sleeve as shown in Figure 1, it being understood that the breech bolt sleeve is suitably tapped to receive said screws.

From the foregoing description it is apparent that with the sight 10 secured to the base 4, as shown in Figure 1, said sight will reciprocate longitudinally of the piece as the breech mechanism of the rifle is operated. As shown in Figure 1, the legs 12, being up set above the plane of the body 5 of the base, permits the firing pin or striker 3 to reciprocate freely between the end of the breech bolt and the sight 10.

In order to preclude the possibility of the sight 10 being displaced slightly after each operation of the breech mechanism due to the possible presence of loose play in said mechanism the under side of the body portion 5 of the base is provided with a depending and forwardly projecting tongue 16. The tongue 16 is shown as being formed integral with the body 5 and as being Wedgeshaped, tapering from a relative thick base at 17 to a relative thin forward edge 18. From examination of Figure 1 it is to be noted that the tongue 16 is disposed upon the base 5 in a manner such that when the base is mounted to the breech bolt the under side of the tongue 16 is substantially parallel to the bottom of the groove 19 which receives the tang 21a of the firing pin when the breech is closed, it being understood that the tongue 16 is of a width substantially equal to that of the groove 19, it is apparent that transverse displacement of the sight by operation of the breech bolt is substantially precluded. To prevent possible vertical displacement of the sight 1 0 by such operation, the body 5 of the base 1s further provided with a plurality of adjustable stops 20. The stops 20 are shown positioned adjacent the side edges of the ody 5 and are in the form of set screws as show n in Figure 4 whereby the same may be vertically adjusted so as to engage the upper faces of the sides of the groove 19 when the breech is closed as shown in Figure 3.

From the foregoing description, it is apparent that by the combined action of the tongue 16 and the groove 19 and the stops 20 and the gun stock that the sight 10 is accurately positioned with respect to the gun barrel after each operation of the breech mechanism and without obstructing the free action of the firing pin.

Referring to the modification illustrated in Figures 5, 6 and 7, it is to be noted that means is provided for mounting a sight upon the bolt sleeve of a rifle without necessitating any alteration of said sleeve, such as providing the same with screw holes as 1s necessary in that form of the invention herein before described.

As shown in Figure 6, the body of the base is substantially of the same form as that illustrated in Figures 1 to 4, it being provided Witli a bifurcation, the legs 21 of which are upset above the plane of the base and perpendicular thereto. The legs 21 are cut away as shown at 22 to receive and abut against the shoulder 23 of the bolt sleeve 24 of a rifle, the said legs being designed to lie on either side of the bolt sleeve as shown in Figure 5 and to be secured thereto by means o-f a yoke 25.

The yoke 25 and the legs 21 are provided with threaded apertures 26 and 27 designed to receive suitable screw bolts 28. The yoke 25, as shown in detail in Figure 7, is provided on its under face with a semi-circular bore 29 designed to engage the bolt sleeve 24. The yoke is further provided with an annu lar shoulder 30 adjacent lto said semi-circular bore at one end thereof and designed to engage the shoulder 31 forming a part of the safety catch mechanism of the rifle bolt sleeve.

The base is further provided with an up standing portion 32 positioned at the base of the bifurcation and being provided with a longitudinal cylindrical bore 33 designed to coincide with the bore of the bolt sleeve when said base is secured thereto as shown in Figure 5. The base extends beyond said upstanding portion 32 a substantial distance as shown at 34 to provide means for'mountimg a sight 35, said sight being pivotally connected to a foot plate 36 and the latter secured to the sight base by means of suitable screw bolts 37. The base is provided with positioning elements similar to those disclosed in the modification illustrated in Figures 1 to 4 and comprising adjustable screw stops 38 for positioning the sight vertically with respect to the gun barrel and a depending tongue 39 for positioning the same transversely as hereinbefore described in connection with the elements 16, 19 and 20 of the first modification of the invention.

As shown in Figure 5, the base when mounted on the bolt sleeve of a rifle, occupies a position such that the cut-out portions 22 of the legs 21 engage the shoulders 23 of the bolt sleeve 24 and the base of the bifurcation engages the outer end of the bolt sleeve, with the bore 33 coaxial with the bore of the bolt sleeve. lith the base in this position the yoke 25 is fitted between the upstanding legs 21 with the semi-circular bore 29 engaging the bolt sleeve 24 and the shoulder 30 engaging the `shoulder 31 of the safety catch mechanism. The screw bolts 28 are then put in place in the apertures 26 and 27 thus locking the base firmly to the bolt sleeve wit-h the bore 33 of the upstanding portion 32 providing a protective housing for the firing pin of the riie.

Having thus described the invention, what I claim is:

l. The combination with a rifle having a sliding bolt breech mechanism and a groove in the stock in which the tang of the firing pin travels, of a sight base mounted on the bolt and movable therewith, and a tongue carried by the base and designed to engage the said groove wien the breech is closed.

2. The combination with a rifle having a sliding bolt breech mechanism, of a sight base carried by the bolt and extending beyond the same, means to mount a sight on the opposite end of the base, said extended portion of the base lying beneath the axis of the bolt to permit free movement of the firing pin.

3. The combination with a rifle having a sliding bolt breech mechanism and a groove in the stock in which the tang of the firing pin travels, of a sight base carried by the bolt, a tongue carried by the base to engage the said groove, and a plurality of stops carried by the base to engage the rifle stock when the breech is closed.

4. rfhe combination with a rifle having a sliding bolt breech mechanism and a groove in the stock in which the tang of the tiring pin travels, of a sight base comprising a body portion provided with a bifurcated eX- tremity, the legs of said bifurcation being up set above the plane of the base and lying in planes perpendicular thereto, and a depending tongue carried by the base, said Dil GEOMETRHM lNSTRUMtN l5.

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legs designed to lie on either side of the breech bolt, and the tongue designed to engage the said groove when the breech is closed and means to mount the base on the breech bolt.

5. The combination with a rifle having a sliding bolt breech mechanism and a groove in the stock in which the tang of the firing pin travels, of a sight base comprising a bifurcated body designed to receive the breech bolt, the opposite extremity of the base extending beyond the end of the bolt and beneath the axis thereof adjacent to the rifle stock, a depending tongue and a plurality of stops carried by the base, said tongue designed to engage the groove of the rifle stock and said stops to engage the rifle stock when the breech is closed whereby the position of the sight with respect to the barrel is definitely determined.

6. The combination with a rifle having a sliding bolt breech mechanism, of a sight base provided with a bifurcated extremity designed to receive the breech bolt, said base extending beyond the bolt and beneath the axis thereof adjacent to the rifle stock, and stops carried by the base to engage the stock when the breech is closed to position the sight vertically with respect to the gun barrel.

7. A sight base for fire arms comprising a bifurcated body, a depending tongue carried by the body, and a plurality of stops adjacent to said tongue.

8. A sight base for fire arms comprising an elongated body provided with a bifurcated extremity, a tongue carried by the body at the base of said bifurcation, and a plurality of adjustable stops adjacent to said tongue.

9. A sight base for iire arms comprising a body, means adjacent one end thereof for mounting a sight thereon, means adjacent to the opposite end for mounting the body on a gun, and adjustable means intermediate the ends for positioning the body on the gun.

10. A sight base for fire arms comprising a body provided with an upset portion, said portion being bifurcated, and terminating in parallel legs lying in planes perpendicular to the plane of the body, and a depending tongue carried by the body at the base of said bifurcation.

11. A sight base for re arms comprising a bifurcated body, the legs of said bifurcation being upset above the plane of the body and perpendicular thereto, said body being arcuate in cross section, a depending and forwardly projecting tongue carried by the body at the base of the bifurcation, and an adjustable stop on either side of said tongue.

12. A gun sight comprising a base having one extremity upset above the plane of the base, a foot plate xedly secured to the opposite end, and an upright member pivotally mounted on said foot plate.

13. The combination with a riiie having a sliding breech bolt and a firin pin slidable therein and projecting beyond the exposed extremity thereof, of a sight base mounted on said end and extending beyond the limit of travel of the iirin pin and a sight Ibmounted on said extende portion of the ase.

14. A sight base for fire arms comprising a body provided with a bifurcated extremity, the legs of said bifurcation being up set beyond the plane of the base, and a removable yoke bridging said bifurcation.

15. A sight base for fire arms comprising a body provided with a bifurcated extremity and a removable yoke bridging said bifurcation, said body being provided with a longitudinal bore communicating with said bifurcation.

16. A sight base for fire arms comprising a body provided with a longitudinal bore and a bifurcated extremity communicating therewith, the legs of said bifurcation extending above t-he axis of said bore, a removable yoke bridging said bifurcation, and means for mounting a sight adjacent to the opposite extremity of the body.

17. A sight base for fire arms comprising a bifurcated body provided with a bore inclined with respect to the plane of the base and communicating with said bifurcation, the legs of said bifurcation extending above the axis of the bore, and a yoke bridging said bifurcation.

18. A sight base for re arms comprising a bifurcated body provided with an inclined bore communicating with said bifurcation, a depending tang at the base of said bifurcation, a plurality of adjustable stops carried by the body, and a yoke bridging the base of said bifurcation.

LOUIS CHARLES BOOTH. 

